1 divided by x to the third power equals x to the negative third. The derivative of x to the negative third is minus three x to the negative fourth.
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Oh, dude, the third derivative of ln(x) is -2/(x^3). But like, who really needs to know that, right? I mean, unless you're planning on impressing your calculus teacher or something. Just remember, math is like a puzzle, except no one actually wants to put it together.
25
The derivative is 2x based on the power rule. Multiply the power by the coefficient of x then drop the power by one.
2
1 divided by 25 multiplied by z to the third power